CN108822253B - Preparation method of 2-methoxyaniline enrichment reagent, product and application thereof - Google Patents
Preparation method of 2-methoxyaniline enrichment reagent, product and application thereof Download PDFInfo
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- VMPITZXILSNTON-UHFFFAOYSA-N o-anisidine Chemical compound COC1=CC=CC=C1N VMPITZXILSNTON-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 239000003153 chemical reaction reagent Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 241000208125 Nicotiana Species 0.000 claims abstract description 35
- 235000002637 Nicotiana tabacum Nutrition 0.000 claims abstract description 35
- 238000001179 sorption measurement Methods 0.000 claims abstract description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 53
- 239000000243 solution Substances 0.000 claims description 50
- 239000000178 monomer Substances 0.000 claims description 28
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 22
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
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- 238000000034 method Methods 0.000 claims description 12
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- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 8
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- 238000002156 mixing Methods 0.000 claims description 5
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- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 4
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- 239000000758 substrate Substances 0.000 description 4
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- ZFXYFBGIUFBOJW-UHFFFAOYSA-N theophylline Chemical compound O=C1N(C)C(=O)N(C)C2=C1NC=N2 ZFXYFBGIUFBOJW-UHFFFAOYSA-N 0.000 description 2
- SNICXCGAKADSCV-JTQLQIEISA-N (-)-Nicotine Chemical compound CN1CCC[C@H]1C1=CC=CN=C1 SNICXCGAKADSCV-JTQLQIEISA-N 0.000 description 1
- 125000002133 (4-hydroxy-3-iodo-5-nitrophenyl)acetyl group Chemical group OC1=C(C=C(C=C1I)CC(=O)*)[N+](=O)[O-] 0.000 description 1
- KMXPHBJUGYLXDM-LSDHHAIUSA-N 1-[(7r,8s)-7-hydroxy-6,6-dimethyl-7,8-dihydropyrano[2,3-f][2,1,3]benzoxadiazol-8-yl]piperidin-2-one Chemical compound N1([C@H]2C3=CC4=NON=C4C=C3OC([C@@H]2O)(C)C)CCCCC1=O KMXPHBJUGYLXDM-LSDHHAIUSA-N 0.000 description 1
- 206010002198 Anaphylactic reaction Diseases 0.000 description 1
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 1
- FMMWHPNWAFZXNH-UHFFFAOYSA-N Benz[a]pyrene Chemical compound C1=C2C3=CC=CC=C3C=C(C=C3)C2=C2C3=CC=CC2=C1 FMMWHPNWAFZXNH-UHFFFAOYSA-N 0.000 description 1
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- SYSQUGFVNFXIIT-UHFFFAOYSA-N n-[4-(1,3-benzoxazol-2-yl)phenyl]-4-nitrobenzenesulfonamide Chemical class C1=CC([N+](=O)[O-])=CC=C1S(=O)(=O)NC1=CC=C(C=2OC3=CC=CC=C3N=2)C=C1 SYSQUGFVNFXIIT-UHFFFAOYSA-N 0.000 description 1
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- 229960002715 nicotine Drugs 0.000 description 1
- SNICXCGAKADSCV-UHFFFAOYSA-N nicotine Natural products CN1CCCC1C1=CC=CN=C1 SNICXCGAKADSCV-UHFFFAOYSA-N 0.000 description 1
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- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/36—Amides or imides
- C08F222/38—Amides
- C08F222/385—Monomers containing two or more (meth)acrylamide groups, e.g. N,N'-methylenebisacrylamide
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Abstract
The invention belongs to the technical field of tobacco detection, and particularly relates to a preparation method of a 2-methoxyaniline enrichment reagent, the 2-methoxyaniline enrichment reagent prepared by the preparation method, and application of the 2-methoxyaniline enrichment reagent. The preparation method is simple to operate, has low cost and is suitable for large-scale industrial production; the 2-methoxyaniline enrichment reagent can specifically adsorb 2-methoxyaniline, and cannot adsorb isomers or other compounds with large molecular structure difference; after the 2-methoxyaniline enrichment reagent is applied to adsorbing 2-methoxyaniline in tobacco shreds, related detection personnel can additionally establish a concentration-ultraviolet absorbance standard curve of the 2-methoxyaniline, and further measure the content of the 2-methoxyaniline in the tobacco shreds by using an ultraviolet spectrophotometry; the 2-anisidine enrichment reagent has short adsorption completion time, is suitable for rapid detection of tobacco product control, and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of tobacco detection, and particularly relates to a preparation method of a 2-methoxyaniline enrichment reagent, the 2-methoxyaniline enrichment reagent prepared by the preparation method, and application of the 2-methoxyaniline enrichment reagent.
Background
Smoking is an unhealthy life habit, and tobacco harm has become one of the serious public health problems in the world today. It is well known that tobacco smoke produced after ignition of a cigarette contains at least 69 known carcinogens; among them, the major harmful chemicals include 5 major classes: (1) aldehydes, nitrides, which have a stimulating effect on the respiratory tract; (2) nicotine, which stimulates sympathetic nerves and enables smokers to become dependent; (3) amines, cyanides and heavy metals, all of which are toxic substances; (4) benzopyrene, arsenic, other radioactive substances, all of which are carcinogenic; (5) carbon monoxide, which greatly reduces the ability of red blood cells to transport oxygen throughout the body.
Wherein, the 2-methoxyaniline with the structural formula as shown in the following is easy to be absorbed by human body:
in particular, 2-methoxyaniline has high toxicity, obviously stimulates the skin and mucous membrane and is easy to cause anaphylaxis. The maximum allowable concentration of the 2-methoxyaniline in the air is 0.5mg/m3(ii) a Its acute toxicity includes at least:
oral cavity LD 501400 mg/kg (mus)
1150mg/kg(rat)
870mg/kg(rbt)。
And, the major stimulatory effects of 2-methoxyaniline include: on the skin: has certain stimulation effect on the skin; inflammation may result if it enters the eye.
However, the analysis of harmful compounds in the side stream smoke of cigarettes mainly adopts a Gas Chromatography (GC) method, a gas chromatography-mass spectrometry (GC/MS) method and a liquid chromatography-mass spectrometry (LC/MS) method. However, these detection methods require large-scale instruments and equipment, and the use and routine maintenance of these equipment are expensive, so that high detection cost is required. In addition, the gas phase detection is limited by the volatility and the thermal stability of the sample, the application range is narrow, and the types of mobile phases are few; the detection time of the liquid phase is long. Therefore, it is necessary to select a detection method with lower cost and simple operation.
Molecular Imprinting Technology (MIT) refers to a technique for preparing a polymer that is selective for a particular target molecule (also called template molecule or imprinted molecule). In 1894, when explaining the specificity of the action of enzymes, e.fischer proposed the "lock and key" theory, i.e. that when an enzyme is bound to a substrate, the structure of the substrate is well matched to that of the active centre of the enzyme, and this complementary shape of the enzyme allows the enzyme to only correspond to the corresponding compound, thereby excluding compounds that do not fit the shape and size. According to the specific binding characteristics of enzyme and substrate molecules, Dickey firstly proposed the concept of molecular imprinting in 1949; methyl orange is used as a template molecule, acidified silicate is used as a monomer, and after polymerization is initiated, methyl orange is eluted by using methanol as an eluent to prepare the methyl orange molecular imprinting silica gel. Compared with the blank silica gel, the material has obviously increased adsorption effect on methyl orange. This technique was gradually recognized until 1972, when the Wulff research group in Germany first reported artificially synthesized molecularly imprinted polymers. In particular, in 1993, swedish scientist Mosbach et al published a research report on theophylline molecularly imprinted polymers in Nature journal, and elucidated the application of molecularly imprinted plastic antibodies and biomimetic immunoassay, so that the molecularly imprinted technology has attracted attention all over the world, and the molecularly imprinted technology has been developed vigorously.
Molecular imprinting techniques can be developed so rapidly, mainly because of three major advantages: presetting: template molecules and functional monomers are selected before polymerization, so that the pre-determination determines that people can prepare different molecularly imprinted polymers (NIPs) according to own purposes so as to meet various different requirements; specific recognition: NIP is polymerized according to the configuration of the template molecule, so that the NIP has specific recognition sites and cavities to recognize the template molecule, and thus, the NIP has strong specific recognition effect; the practicability is as follows: NIP has good stability and is not affected by high temperature and acid and alkali. Compared with natural biological molecules, such as enzyme and substrate, antigen and antibody, receptor and hormone, the molecularly imprinted polymer can resist severe environmental influence, has mild storage condition and can retain the recognition performance for a long time. Particularly, the prepared nanoscale molecularly imprinted polymer has an 'imprinted cavity' of the template molecule on the surface, and when the molecularly imprinted polymer is applied to a system in which the template molecule exists, the molecularly imprinted polymer can selectively adsorb the target molecule (template molecule), so that the target molecule is separated from other substances.
Disclosure of Invention
Aiming at the defects of the exclusive analysis method for the single component of the 2-methoxyaniline in the existing tobacco detection technology, the invention aims to provide an enrichment reagent which is used for specifically adsorbing the 2-methoxyaniline and cannot adsorb other compounds with large differences of isomers or molecular structures of the 2-methoxyaniline; furthermore, the enrichment reagent can be used for adsorbing 2-methoxyaniline which exists in tobacco shreds in a trace manner, so that the tobacco quality detection is facilitated.
Accordingly, in a first aspect, the present invention provides a method for preparing a 2-methoxyaniline enrichment reagent, which comprises the following steps:
s1: accurately weighing acrylic acid, a monomer alpha and a crosslinking agent beta, and dissolving in water by ultrasonic; then adding an absolute ethyl alcohol solution of a monomer gamma, and carrying out ultrasonic degassing;
s2: after the pH value is adjusted to be 6-7, adding 2-methoxyaniline serving as a template molecule;
s3: slowly dripping an aqueous solution of an initiator, and carrying out polymerization reaction for 20-25 h at the temperature of 32-35 ℃;
s4: after the reaction is completed, ethanol-chloroform is used as an extracting agent, a Soxhlet extractor is adopted for refluxing overnight, so as to elute the template molecules and prepare a molecular imprinting polymer crude product;
s5: dialyzing the molecular imprinting polymer crude product to remove unpolymerized initiator or/and acrylic acid or/and monomer alpha or/and monomer gamma, and then freeze-drying dialyzate to prepare molecular imprinting polymer solid powder, namely the 2-methoxyaniline enrichment reagent;
wherein the structural formula of the monomer alpha is as follows:
wherein the structural formula of the crosslinking agent beta is as follows:
wherein the structural formula of the monomer gamma is as follows:
preferably, in the above production method, in S1, the molar ratio of the acrylic acid to the monomer α is 1:2, the molar ratio of the acrylic acid to the crosslinking agent beta is 1: 10, the molar ratio of acrylic acid to monomer γ is 1: 1.
preferably, in the preparation method, in S1, the ultrasonic degassing lasts for 5-15 min.
Preferably, in the above preparation method, the molar ratio of the acrylic acid to the 2-methoxyaniline is 1:2 to 1: 16.
Further preferably, in the above production method, the molar ratio of the acrylic acid to the 2-methoxyaniline is 1: 8.
Preferably, in the above preparation method, the initiator consists of ammonium persulfate, sodium bisulfite and sodium lauryl sulfate.
It should be noted that, in this context, the water used in each step is distilled water.
The second aspect of the invention provides a 2-methoxyaniline enrichment reagent which is prepared by the preparation method of the first aspect of the invention.
Meanwhile, the third aspect of the invention provides an application of the 2-methoxyaniline enrichment reagent of the second aspect in specifically adsorbing 2-methoxyaniline in tobacco shreds, which comprises the following steps:
dissolving the 2-methoxyaniline enrichment reagent in water by ultrasonic waves to prepare an enrichment reagent solution; and then, mixing the ethanol solution of the tobacco shreds with the enrichment reagent solution, and carrying out ultrasonic oscillation for 20-30 min to finish specific adsorption.
Preferably, in the above application, the concentration of the enrichment reagent solution is 1 mg/mL.
Preferably, in the above application, the step of preparing the ethanol solution of the cut tobacco comprises:
weighing cigarette tobacco shreds, placing the cigarette tobacco shreds in absolute ethyl alcohol, heating and refluxing for 0.5-1.5 hours in a water bath, then, carrying out suction filtration, and then, filtering by using a 220nm microporous filter membrane to obtain an ethanol solution of the tobacco shreds.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects: the preparation method of the 2-methoxyaniline enrichment reagent provided by the invention is simple to operate, has low cost and is suitable for large-scale industrial production; the 2-methoxyaniline enrichment reagent provided by the invention is actually a molecularly imprinted polymer, and can specifically adsorb 2-methoxyaniline, but cannot adsorb isomers or other compounds with large molecular structure differences; in addition, after the 2-methoxyaniline enrichment reagent is applied to adsorbing 2-methoxyaniline in tobacco shreds, related detection personnel can additionally establish a concentration-ultraviolet absorbance standard curve of the 2-methoxyaniline, and further measure the content of the 2-methoxyaniline in the tobacco shreds by using an ultraviolet spectrophotometry; in addition, the 2-anisidine enrichment reagent is short in adsorption completion time and suitable for rapid detection of tobacco product control, so that the reagent has a wide application prospect.
Drawings
FIG. 1 is a schematic diagram of the preparation principle of a molecularly imprinted polymer;
FIG. 2 is a TEM image of a 2-methoxyaniline enrichment reagent according to the present invention;
FIG. 3(A) is a standard curve of concentration of 2-methoxyaniline versus ultraviolet absorbance, and FIG. 3(B) is a graph of ultraviolet absorbance of 2-methoxyaniline (5. mu.g/mL) before and after adsorption of the 2-methoxyaniline-rich reagent.
Detailed Description
The present invention will be further described with reference to specific embodiments, but the present invention is not limited to the following embodiments. The experimental procedures in the following examples, unless otherwise specified, were all performed routinely; materials, reagents, and the like used in the following examples are commercially available from public unless otherwise specified.
According to the first aspect of the present invention, in a preferred embodiment, the method for preparing the 2-methoxyaniline enrichment reagent comprises the following steps:
s1: accurately weighing acrylic acid (0.2-0.3mmol), monomer alpha and crosslinking agent beta, and ultrasonically dissolving in 80mL of water; then adding an absolute ethyl alcohol (1mL) solution of a monomer gamma, and ultrasonically degassing for 10 min;
s2: after the pH value is adjusted to be 6-7, adding 2-methoxyaniline serving as a template molecule;
wherein, template molecules are respectively added according to the following molar ratios:
NIP-1: (acrylic acid: template molecule ═ 1:2)
NIP-2: (acrylic acid: template molecule ═ 1:4)
NIP-3: (acrylic acid: template molecule ═ 1:8)
NIP-4: (acrylic acid: template molecule ═ 1:16)
S3: slowly dripping an aqueous solution of an initiator (ammonium persulfate, sodium bisulfite and sodium dodecyl sulfate) and carrying out polymerization reaction for 20-25 h at the temperature of 32-35 ℃;
s4: after the reaction is completed, ethanol-chloroform is used as an extracting agent, a Soxhlet extractor is adopted for refluxing overnight, so as to elute the template molecules and prepare a molecular imprinting polymer crude product;
s5: dialyzing the molecular imprinting polymer crude product with distilled water for 2-3 days, changing water 3 times every day to remove unpolymerized initiator or/and acrylic acid or/and monomer alpha or/and monomer gamma, and freeze-drying dialysate to prepare molecular imprinting polymer solid powder, namely 2-methoxyaniline enrichment reagent;
wherein the structural formula of the monomer alpha is as follows:
wherein the structural formula of the crosslinking agent beta is as follows:
wherein the structural formula of the monomer gamma is as follows:
the 2-methoxyaniline enrichment reagent according to the second aspect of the present invention is prepared by the preparation method described in the first aspect.
The application of the 2-methoxyaniline enrichment reagent in the third aspect of the invention in the specific adsorption of 2-methoxyaniline in tobacco shreds comprises the following steps:
dissolving the 2-methoxyaniline enrichment reagent in water by ultrasonic waves to prepare an enrichment reagent solution; wherein the concentration of the enrichment reagent solution is 1 mg/mL; then weighing 5g of cigarette tobacco shreds, placing the cigarette tobacco shreds in 250ml of absolute ethyl alcohol, heating and refluxing for 0.5 hour in a water bath, then carrying out suction filtration, taking a crude filtrate, filtering the crude filtrate by using a 220nm microporous filter membrane, and taking a filtrate to obtain an ethanol solution of the tobacco shreds; mixing the ethanol solution of the tobacco shreds with the enrichment reagent solution, and carrying out ultrasonic oscillation for 20-30 min to complete specific adsorption;
in addition, the adsorption capacity of each 2-methoxyaniline enrichment reagent to 2-methoxyaniline is detected by an HPLC method, the enrichment reagent with the maximum adsorption quantity is determined, and the result shows that the adsorption quantity of the enrichment reagent NIP-3 is the maximum.
Example 1:
accurately weighing acrylic acid (0.2mmol), monomer alpha (0.4mmol) and crosslinking agent beta (2mmol), ultrasonically dissolving in 80mL of distilled water, adding 1mL of absolute ethanol solution of monomer gamma (0.2mmol), and ultrasonically degassing for 10 min; then, the pH was adjusted to 7 with NaOH, 1.6mmol of template molecule (2-methoxyaniline) (which was dissolved in distilled water) was added, and shaking was carried out at a constant temperature of 70rpm (35 ℃) for 4 hours; then, an aqueous solution of an initiator (ammonium persulfate (60.0mg), sodium bisulfite (20.0mg), and sodium dodecyl sulfate (40.0mg) dissolved in 20mL of distilled water) was slowly added dropwise at a rate of 1 to 2 drops/sec, and polymerization was carried out at 35 ℃ for 21 hours;
after the reaction is completed, ethanol-chloroform is used as an extracting agent, a Soxhlet extractor is adopted for refluxing overnight, so as to elute the template molecule (2-methoxyaniline), and a crude product of the molecularly imprinted polymer is prepared;
dialyzing the molecular imprinting polymer crude product with distilled water for 2-3 days, changing water 3 times every day to remove unpolymerized initiator or/and acrylic acid or/and monomer alpha or/and monomer gamma, and freeze-drying dialyzate to prepare a 2-methoxyaniline enrichment reagent NIP-3 which is nanosphere with the particle size of about 200nm as shown in figure 2;
ultrasonically dissolving the 2-methoxyaniline enriched reagent NIP-3 in water to prepare 1mg/mL enriched reagent solution;
weighing 5g of cigarette tobacco shreds, placing in 250ml of absolute ethanol, heating and refluxing in water bath for 1.5 hours, then, carrying out suction filtration, taking a crude filtrate, filtering the crude filtrate by using a 220nm microporous filter membrane, and taking the filtrate to obtain an ethanol solution of the tobacco shreds; mixing the ethanol solution of the tobacco shred with the enrichment reagent solution, and carrying out ultrasonic oscillation for 30min to complete selective adsorption.
Example 2:
preparing enrichment reagent solution (1mg/mL)
Accurately weighing 5.0mg of 2-methoxyaniline enriched reagent NIP-3, ultrasonically dissolving in 5.0mL of distilled water, and preparing into 1mg/mL enriched reagent solution;
measurement of concentration of 2-methoxyaniline-ultraviolet Absorbance Standard Curve (0.1, 0.2, 0.5, 1.0, 2.0, 4.0, 5.0, 10.0. mu.g/mL)
A standard solution of 100. mu.g/mL of 2-methoxyaniline was purchased or prepared by oneself: 2.0mg of 2-methoxyaniline was accurately weighed and dissolved in 20.0mL of absolute ethanol.
Preparation of 10. mu.g/ml 2-methoxyaniline solution: 1ml of a 100. mu.g/ml 2-methoxyaniline solution +9ml of absolute ethanol; preparation of 5. mu.g/ml 2-methoxyaniline solution: 5ml of a 10. mu.g/ml 2-methoxyaniline solution +5ml of absolute ethanol; preparation of 4. mu.g/ml 2-methoxyaniline solution: 2ml of a 10. mu.g/ml 2-methoxyaniline solution +3ml of absolute ethanol; preparation of 2. mu.g/ml 2-methoxyaniline solution: 2ml of a 5. mu.g/ml 2-methoxyaniline solution +3ml of absolute ethanol; preparation of 1. mu.g/ml 2-methoxyaniline solution: 3ml of 2-methoxyaniline solution with the concentration of 5 mu g/ml and 12ml of absolute ethanol; preparation of 0.5. mu.g/ml 2-methoxyaniline solution: 6ml of 2-methoxyaniline solution with the concentration of 1 mu g/ml and 6ml of absolute ethanol; preparation of 0.2. mu.g/ml 2-methoxyaniline solution: 4ml of 0.5. mu.g/ml 2-methoxyaniline solution +6ml absolute ethanol; preparation of 0.1. mu.g/ml 2-methoxyaniline solution: 4ml of a 0.2. mu.g/ml 2-methoxyaniline solution +4ml of absolute ethanol; ultraviolet absorbance at each concentration was measured, and a calibration curve was prepared as shown in fig. 3 (a).
③ Rapid adsorption of 2-methoxyaniline
At room temperature, 2.0mL of the enriched reagent solution and 1.0mL of 2-methoxyaniline solution (5. mu.g/mL) were placed in a 5mL centrifuge tube, subjected to ultrasonic oscillation for 20min, centrifuged (10000rpm/30min), and the supernatant was collected.
Fourthly, detecting the adsorption quantity of the enrichment reagent by an ultraviolet spectrophotometer, and calculating a Q value (see figure 3 (B)):
the UV absorbance of the 2-methoxyaniline solution (5. mu.g/mL) was 1.013(283 nm); adsorbing with 2-methoxyaniline enriched reagent NIP-3, centrifuging, and collecting supernatant containing 2-methoxyanilineThe ultraviolet absorbance of the phenylamine was 0.245(283nm), and the concentration of 2-methoxyaniline in the supernatant was calculated according to the standard curve as Ct＝1.5μg/mL。
According to the formula Q ═ C0-Ct)×V]Calculating the Q value by the aid of the/M; wherein C is0Concentration of 2-methoxyaniline before adsorption (mg/mL), Ct-the concentration of 2-methoxyaniline in the supernatant after adsorption and centrifugation (mg/mL), V-the volume of 2-methoxyaniline solution added (mL), M-the mass of enrichment reagent added (g); the calculation result was 1.75mg/g, which indicates that 1.75mg of 2-methoxyaniline can be selectively adsorbed per gram of 2-methoxyaniline-enriched reagent NIP-3.
Example 3:
cutting a commercially available cigarette Y, taking out and drying the cut tobacco, preparing an ethanol solution of the cut tobacco according to the steps in the embodiment 1, mixing the ethanol solution of the cut tobacco with the enrichment reagent solution (1mg/mL) prepared in the embodiment 2, and carrying out ultrasonic oscillation for 25min to complete selective adsorption; further taking ethanol-chloroform as an extracting agent, refluxing overnight by adopting a Soxhlet extractor to elute the 2-methoxyaniline, and then measuring the content of the 2-methoxyaniline in the extracting agent by utilizing an ultraviolet spectrophotometry method on the basis of establishing a standard curve of the concentration of the 2-methoxyaniline and the ultraviolet absorbance, thereby indirectly measuring the content of the 2-methoxyaniline in the tobacco shreds of the cigarettes Y. Also, since ultraviolet spectrophotometry is a technique known in the art, it is not described herein in detail.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (7)
1. The preparation method of the 2-methoxyaniline enrichment reagent is characterized by comprising the following steps of:
s1: accurately weighing acrylic acid, a monomer alpha and a crosslinking agent beta, and dissolving in water by ultrasonic; then adding an absolute ethyl alcohol solution of a monomer gamma, and ultrasonically degassing, wherein the molar ratio of the acrylic acid to the monomer alpha is 1:2, the molar ratio of the acrylic acid to the crosslinking agent beta is 1: 10, the molar ratio of acrylic acid to monomer γ is 1: 1;
s2: after the pH value is adjusted to be 6-7, adding 2-methoxyaniline serving as a template molecule, wherein the molar ratio of acrylic acid to the 2-methoxyaniline is 1: 2-1: 16;
s3: slowly dripping an aqueous solution of an initiator, and carrying out polymerization reaction for 20-25 h at the temperature of 32-35 ℃;
s4: after the reaction is completed, ethanol-chloroform is used as an extracting agent, a Soxhlet extractor is adopted for refluxing overnight, so as to elute the template molecules and prepare a molecular imprinting polymer crude product;
s5: dialyzing the molecular imprinting polymer crude product to remove unpolymerized initiator or/and acrylic acid or/and monomer alpha or/and monomer gamma, and then freeze-drying dialyzate to prepare molecular imprinting polymer solid powder, namely the 2-methoxyaniline enrichment reagent;
wherein the structural formula of the monomer alpha is as follows:
wherein the structural formula of the crosslinking agent beta is as follows:
wherein the structural formula of the monomer gamma is as follows:
wherein the initiator consists of ammonium persulfate, sodium bisulfite and sodium dodecyl sulfate.
2. The method for preparing the 2-methoxyaniline enrichment reagent according to claim 1, wherein in S1, the ultrasonic degassing lasts for 5-15 min.
3. The method for preparing a 2-methoxyaniline enrichment reagent according to claim 2, wherein the molar ratio of the acrylic acid to the 2-methoxyaniline is 1: 8.
4. A2-methoxyaniline enrichment reagent, which is characterized in that the 2-methoxyaniline enrichment reagent is prepared by the preparation method according to any one of claims 1 to 3.
5. The application of the 2-methoxyaniline enrichment reagent in the specific adsorption of 2-methoxyaniline in tobacco shreds according to claim 4, characterized by comprising the following steps:
dissolving the 2-methoxyaniline enrichment reagent in water by ultrasonic waves to prepare an enrichment reagent solution; and then, mixing the ethanol solution of the tobacco shreds with the enrichment reagent solution, and carrying out ultrasonic oscillation for 20-30 min to finish specific adsorption.
6. The use according to claim 5, wherein the concentration of the enrichment reagent solution is 1 mg/mL.
7. Use according to claim 5, wherein the step of preparing an ethanol solution of tobacco shreds comprises:
weighing cigarette tobacco shreds, placing the cigarette tobacco shreds in absolute ethyl alcohol, heating and refluxing for 0.5-1.5 hours in a water bath, then, carrying out suction filtration, and then, filtering by using a 220nm microporous filter membrane to obtain an ethanol solution of the tobacco shreds.
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